Synergistically combined with 3 genetically distinct probiotic organisms and prebiotic Fructooligosaccharide (FOS), to support probiotic activity in the intestines.A good probiotic supplement has its place in any well-rounded supplementation program, regardless of diet. Maintaining healthy intestinal flora helps the whole body stay well. 21st Century s Acidophilus, synergistically combined with 3 other genetically distinct probiotic organisms and prebiotic Fructooligosaccharide (FOS), is designed to aid in the maintenance of probiotic activity in the intestine. Probiotics is a good step to take for supporting healthy digestion and optimal nutrition.